package com.itheima.reggie.service.impl.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.impl.CategoryService;
import com.itheima.reggie.service.impl.DishService;
import com.itheima.reggie.service.impl.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category>  implements CategoryService {


    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类 ，删除之前判断
     * @param id
     */
    @Override
    public void remove(Long id) {
        LambdaQueryWrapper<Dish> dishqueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件
        dishqueryWrapper.eq(Dish::getCategoryId, id);
        int count1=dishService.count(dishqueryWrapper);
        //查询当前分类是否关联了菜品 ，如果已经关联，抛出业务异常  在Dish表里的catagroy_id的数量是否存在
        if(count1>0){
            //已经关联菜品，抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //查询当前分类是否关联了套餐 ，如果已经关联，抛出业务异常
        LambdaQueryWrapper<Setmeal> setmealqueryWrapper = new LambdaQueryWrapper<>();
        setmealqueryWrapper.eq(Setmeal::getCategoryId, id);
        int count2=setmealService.count(setmealqueryWrapper);
        if(count2>0){
            //已经关联了套餐
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        super.removeById(id);
    }
}
